Stuffing box for pit bearings



Nav. 17, 1925. f 1,561,838

O. W. DUNHAM STUFFING Box FOR PIT BEARINGS Filed May 11, 1923 ywentoz www f 0.14./ z//v/MM v wwwa/Yu Moi/Majo Patented Nov. 17, 1925,

UNlfreoi BA1-aua- ORSON W. DUN'HAMQ OF"TREECE,L2KANSAS, 'ASSIGTTOlR TOf ARMNT A5' DUNHAEE BAXTER- SPRINGS-,l KANSAS.'

STUFF'INGBXJ FOR IPI-'T' BEARINGS 'Application fried 'inlayl 11:, 1923; serial Noress'gasaf T al?, w hom it may" concern Be it known that', a citizen of theA United States, residingjf'at` Treece, State of Kansas, haveinvente'dL certain new and 'useful Improvements in'Stuff'f ing 'Boxes for Pit Bearingsgandl do de#- clare the-following'to' be'afull, clear,VIA and' exact description of 'the invention,I4 suchy vas will'enableothers skilled'in the art to which it appertainsl to' make "and u'se'ithe' same. f

This invention relates' tof'animproved which lan` endless' bucket"conveyorrpasses for;

' mounted about the shaft and connected with the inner end portion of the bearing cup so that the open inner end of the cup is closed and water excluded. The means for closing the open inner end of the cup includes a. major stuiiing box having packing meansl therein and an auxiliary stufng box which is positioned within the main stuing box and provided with packing means, the packing means of the main stufng box including a spring which serves to compress packing rings about the sha-ft and also serves to retain the auxiliary stuffing box in the proper position. The shaft-carrying cup is provided with an improved construction whereby the end portion of the shaft which extends into this cup may be well lubricated and thus caused to turn easily.

This invention is illustrated in the accompanying drawing, wherein The figure is a view showing the improved shaft mounting and stuiiing y box in longitudinal section with one end portion of the shaft extending into the same and shown in elevation.

This shaft mounting in connection with which my improved stuffing box is used, is provided with a cup 1 which fits upon lthe end portion of the shaft 2 and is open at its inner end. It is upon this shaft that a sprocket or its equivalent (not shown) for thech-ain ofthe conveyor"v istfm'ounted.l Afprojection 3 is provided at the center' 'of thev head-A forinedfatmthe"l outer' end f of this cup'V to engage the end I'of the shaft?` as" shown' IandI the wallsofthe cup have beenprovided with? ribs f4 which extend a circumferentially of the'fcupla1fid-fdivide-thel sameinto^=giease pockets* 5. l The" cup* 1 is provided fwith -a bearing -orA bushing i composedY of. sect-ions?! S` and 9,onef`of which nraybefforined"ofbrass or otherv wearresistingmaterial.y Ir11"o'1"derto" retain theL bushing in placegs-theUopen nd portion l"ofthecup '1 liasbeenprovided 'thf agroeve forming' aiseai: llotifnwhch avre tainer'orfcl-'osure' 'ring l11 isplaoedf Arr-ont? standing lfla'ngei or collar' 121i 'prtfvidledilai-idY intermediateit's lengtlfifglth pislprovidd with ff upwardly' extendi'ng-l arms# 13y avi-ng openings --toreceivefasecurinig bolt- Lbyf means; fof fwhichV the; shaftiniountinfg isli'arP eterea to ab arB-'liindieated zbyidorted lines; There has also been provided a strap ring which may be. engaged by a grapple in order to move the conveyor frame upwardly when desired.

' As previously stated, it is desired to prevent water from entering the bearing cup 1 and also prevent the grease from working out of the same. Therefore, there has been provided packing means which includes a major stuiling box 16 and an auxiliary stuifing box 17 which fits inside the major stuffing box. These so-called boxes are in the form of open-ended cups. This main or major stuiing box is provided with an outstanding flange or collar 18 which is of the same size as the collar 12, these collars being suitably connected. A gasket 2O formed of rubber or any other suitable material is provided between the major stufing box and cup and will provide a water-tight joint. From an inspection of the drawing, it willv be seen that this gasket is of the same'external diameter as the collars 12 and 18 and has an opening of just suiiicient size to permit the shaft 2 to pass through it. Therefore, the gasket 20 covers the washer 11 and will be engaged by the outstanding flange 21 of the auxiliary stuffing box 17. Within the auxiliary stuliing box, there has been provided packing rings 22 which are formed of 'the usual material and there has also been provided a spring 23 which has its inner end engaging the packing rings 22 and its outer end engaging the gasket 20. The gasket 1s reinforced by the ring or Washer 1l which holds the bushing in place and therefore the spring Will exert pressure to contract the packing rings 22 about the shaft. Within the major stufling box, there has also been provided packing rings 24 Which are of course larger' and thicker than the packing rings 22. A protecting Washer 25 is provided for these packing rings 24 and this Washer 25 is engaged by a spring 26 which is a great deal heavier and stronger than the spring 23. The outer end portion of this spring 26 engages the outstanding flange 21 of the auxiliary stuffing box and therefore this spring Will serve to compress the packing rings 24 and also serve to hold the auxiliary stuffing box in place with its outstanding fiange engaging the gasket 20 and prevent it from bek ing moved by the spring 23. By this arrangement, the packing rings 24C Will serve to provide major means for excluding Water from the cup l in case it attempts to Work along the shaft 2 into the cup and the packing rings 22 Will serve as auxiliary means to exclude any Water Which may happen to Work past the-rings 24;. Therefore, there has been provided a shaft mounting in which the shaft Will be rotatably mounted in the cup l in a very efficient manner and Water prevented from Working into this cup and grease prevented from Working out of this cup.

I claim:

l. A stuiing box composed of main and auxiliary sections, said auxiliary section being disposed Within said main section, packings Within said sections, and a spring surrounding the auxiliary section and bearing at one end against the packing in said main section and at its opposite end against the auxiliary section to maintain the latter in place.

2. A. stufling box comprising main and auxiliary sections, said sections being cuplike in formation and the auxiliary section being fitted into the main section, packing fitted into said sections, a spring Within the auxiliary section for compressing the packing therein, and a spring surrounding the auxiliary section and Within the main section for compressing the packing in the latter, said spring also engaging said auxiliary section for maintaining the same in place, and a closure for the open ends of said sections against Which the pressure of both of said springs is exerted.

In testimony whereof I have hereunto affixed my signature.

oRsoN W. DUNHAM. 

